Prometheus Recording Rules: A Developer's Guide to Query Optimization

High-cardinality metrics can overwhelm Prometheus by generating numerous time series, slowing performance and increasing storage needs. Using recording rules can aggregate these metrics, reducing cardinality and optimizing queries. Key benefits include improved query speed, reduced storage needs, easier dashboard creation, and more reliable alerts. It's important to use clear naming conventions, keep rules simple, and monitor their performance. Advanced techniques like chaining rules, using math in queries, and employing subqueries can further enhance efficiency.